Classic integration of advanced log data, vertical seismic profiles and surface seismic data helps explain less-than-expected shows from two exploration wells in the South China Sea.
Despite similar levels of oil production, the UK and Norwegian North Sea sectors are at markedly different stages of maturity. We illustrate the differences by looking at two fields-one UK and one Norwegian-currently under development.
Well testing involves an array of downhole hardware that has become increasingly sophisticated. Controlling the tools downhole now employs electro hydraulics in addition to the traditional mechanical methods. Pressure measurement has become significantly more accurate, while data are increasingly read out at surface in real time.
In its simplest form, testing provides short-term production of reservoir fluids to the surface permitting the operator to confirm the show-indicated by cuttings, cores and logs-and estimate reservoir deliverability. In its subtlest form, measured pressure transients caused by abrupt changes in production can characterize completion damage, reservoir permeability and distant reservoir heterogeneities.
The introduction of a new wireline testing tool is set to revolutionize testing strategy, creating new standards of accuracy in wireline formation sampling and pressure measurement, and opening up transient testing opportunities such as measuring permeability anisotropy.
Tough economic times, coupled with more wells being drilled in harsher environments, have advanced well testing on two fronts, technically and procedurally. Here is a look at how operators are sharpening test objectives and finding ways to fulfill them more efficiently.
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